When Emacs first visits an Org file, the global state is set to
showeverything, i.e., all file content is visible6. This can be configured through the
org-startup-folded, or on a per-file basis by adding one of
the following lines anywhere in the buffer:
#+STARTUP: overview #+STARTUP: content #+STARTUP: showall #+STARTUP: show2levels #+STARTUP: show3levels #+STARTUP: show4levels #+STARTUP: show5levels #+STARTUP: showeverything
Furthermore, any entries with a ‘VISIBILITY’ property (see Properties and Columns) get their visibility adapted accordingly. Allowed values for this property are ‘folded’, ‘children’, ‘content’, and ‘all’.
Switch back to the startup visibility of the buffer, i.e., whatever is requested by startup options and ‘VISIBILITY’ properties in individual entries.